Striking-drill for mining purposes



" No Model.) A.

A. L.,'BUTL ER & M. G; BULLOCK.

Striking Drill for Min ingPurposes.

rim-236,774. Patented Jan. 18, I881.

hilt-test: I Inventors.-

Q W08. M, J. M LL- ALBERT L. BUTLER AND. MILAN o.

PATENT OFFIQE.

BULLOCK, OF CHICAGO, ILLINOIS.

STRlKlNG-DRILL FOR MINING PURPOSES.

SPECIFICATION forming part of Letters Patent No. 236,774, dated January18, 1881.

Application filed October 29, 1880. (No model.)

To all whom it may concern Bait known that we, ALBERT L. BUTLER andMILAN (LBU'LLOGK, of the city of Ohicago, in the county of Cook andState of Illifollowing is a full, clear, and exact description of theinvention, which will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference markedthereon,which form a part of this specification.

Our object is the. production of an effective striking-drill, first,which will be of such spiral form as to eflectu'aly free the hole beingdrilled from chips; second, in which the necessity of frequently shapingand forging the cutting end after the points or blades shall have wornaway is avoided by making its contour the same throughout its length;third, that by such uniform contour any part or section of the drill, ifbroken at any point in its length, may be effectively usedwithoutforging the same; fourth, that the body and shank of the drillmay be of the same size and strength as the cutting end; fifth, makingthe holdingsocket of the piston of such form or contour as that the headand likewise any section of the drill may be firmly held bysuchholdingsocket, so that if the'drill be out or broken off at any point inits length the long piece, or any portion left, may be immediatelyinserted into the socket and the work proceed without waiting to forgeanother head upon said piece to fit the said socket.

The invention consists, first, in a strikingdrill grooved or flangedspirally throughout its entire length, and having the cutting-edge ofthe same diameter as. that of the drill at any point.

The invention consists, secondly, in combining with such a drill aholding-socket of such interior form or contour as will adapt it toreceive the head or any section of the drill, so that if the drillshould be cut or broken ofi at any point in its le'ngth'any part of thedrill may be inserted within the socket.

The invention consists, thirdly, in combin ing in a percussiondrilling-machine a spirally grooved or flanged drill with a piston-rodcarrying a socket whose interior form or contour adapts it to receiveand hold the head or any part of the length of said drill.

Such a drill may be made either by rolling the metal to the desired formof cross-section and then twisting the same, or in any other suitablemanner, producing a spirally-grooved drill, or (and preferably) one ofequal diame ter and form throughout.

The drawings illustrate only one of the many forms of spiral for suchdrills which may be used.

Figure 1 represents a perspective view of a drilling-machine with ourimprovements at tached. Fig. 2 is a side view of our twisted drill. Fig.3 is an end view of the same. Fig. 4 is a side view of the head withapart of the socket removed. Fig. 5 is a view of the same with the capon.

A represents the twisted drill; B, the drilling-machine; G, the end ofthe piston-rod; D, the ordinary encircling strap; F, the cap, which isclamped firmly to the drill by means of the nut E.

It will be seen that the socket at the end of the piston-rod has suchinterior formation as will allow it to receive any portion of the lengthof the drill, the socket having spiral recesses or grooves correspondingin shape and pitch with the spiral flanges of the drill.

In addition-to the advantages possessed by our invention, as abovepointed out, it may be stated that by giving to the spirally grooved orflanged drill a diameter common to allparts of its length andcutting-point the hole which is being drilled is kept freer from chipsthan by the use of drills with an enlarged striking end. This may resultfrom the increased diameter of the drill as an elevating medium incarrying up the chips, which, in one revolution, will lift a greaterquantity than a drill of smaller diameter, or from there being lessannular space left between the drill and the sides of the hole for theaocum ulation of chips. It is also found that friction is reduced in theuse of this drill.

A noticeable advantage attending the use of a socket interiorly groovedto receive the spiral flanges of the drill is, that the concussion,which in other forms of socket is concentrated upon a smallresisting-surface, is in this case distributed throughout the socketwith the best possible results, as every portion of the drill within thesocket imparts the concussion to a similarly-shaped bearing-surface inthe socket.

A socket of this description is specially and conveniently adapted foruse as a part of a piston in a percussion drilling-machine, in whichrelation it is here shown and claimed.

\Ve are aware that spiral drills for metalworkingaud also forrock-drilling are not new; but, with respect to rock-drills, we areunaware that any have heretofore been used of a common diameterthroughout their entire length and at their cutting-points.

The useof such twisted or spirally flanged or grooved rock-drills ashave heretofore been used is not, we believe, attended with theadvantages which are connected with the use of drills of ourconstruction.

What we claim, and desire to secure by Let ters Patent, is-

1. A spirally grooved or flanged drill having 2. diameter common to allparts of the length 25 of its body and cutting-points, substantially asdescribed.

2. A spirally grooved orflanged drill'having a common shape and diameterthroughout its entire length, combined with aholding-socket c theinterior form or contour of which adaptsit to receive and hold the headorany part of the length of said drill, substantially as described.

3. In a percussion drilling-machine, aspirally grooved or flanged drill,combined with 5 a piston-rod carrying a socket the interior form orcontour of which adapts it to receive and hold the head or any part ofthe length of said drill, substantially as specified.

In witness whereof we hereunto aflix our 0 signatures, in the presenceof two witnesses, this 19th day of October, A. D. 1880.

ALBERT L. BUTLER. MILAN C. BULLOCK.

Witnesses:

P. R. MARLING, JOHN CARLSON.

